Comment 25 for bug 19711

just found this. So it's milliseconds.

----------------------------------
from acpi.sf.net:

Operation Command Sample Output
Read cat power active state: C2
default state: C1
bus master activity: 00000000
states:
   C1: promotion[C2] demotion[--] latency[000] usage[00000450]
  *C2: promotion[--] demotion[C1] latency[020] usage[00039420]
   C3: <not supported>

active state:
This is the sleep state currently used when the system is idle.

default state:
During high system loads and during booting this sleep state is used when the
system is temporarily idle.

bus mastering activity:
When bus mastering control is available (see "info" above), this shows the bus
mastering activity during the last 32 calls of the idling routine. (A bus master
is a device on your system which can access the memory without having to use the
CPU for this.) When the system is quite idle, the ACPI system may want to put
the CPU in the C3 sleep state. In this state the CPU cannot detect if a bus
master changes anything or reads from the system memory. In the case when the
CPU holds copies of this memory in its "write-back cache" or even in its
"inbound" cache, the bus master might read wrong values. This leads to data
corruption, and probably to an instable system, if not a "crash".

states:
*: this is the currently active idling state. This does not mean the system is
currently idle. It only reflects which processor sleep state is called when the
system becomes idle.
C1: the name of this state. (Note: C0 is not mentioned, it is the CPU "working"
state)
promotion[C2]: when the system load is very low, the ACPI system might decide to
switch to this C-State. Of course, this is not available for the highest
supported C-State.
demotion[--]: when the system load is higher, the ACPI system might decide to
swithc to this C-State. Of course, this is not available for the lowest C-State
latency[000]: after an Interrupt Request reaches the CPU, it takes this time in
microseconds until the Interrupt can be processed.
usage[00000450]: the number of times this sleep state has been called.